It depends on what the driver or the fisherman want in that moment.
Yes. This is human nature. However, in that moment we aren't very good at predicting how we will feel in future moments. Should children eat what they feel like in the moment? Should adults do what they want in the moment, even if it is harmful? We all live in the moment - but each moment doesn't have to be a nail in our future coffin.
Also correct. It doesn't have to be. In your example, it's either going home early and doing your job regularly on a sunny day, or preferring to keep working and go to the beach on that sunny day. It's a choice to be made, and that's what I refer to with "want". People make choices. The important part is to be conscious about the choices, like the fisherman. He could work more and retire early. But he chooses not to.
That's something we can do as adults, as we are responsible for the consequences. And that is what children have to learn, to be able to make decisions and stand up for them, taking the responsibility for them. If we as parents actively choose our parenting style because we're conscious, then yes, it's probably not perfect, but there is at least a line to walk, it's not instinctual, but based on a decision that we can defend in front of ourselves, and later in front of our children when they come and ask us why.